#include<stdio.h>

int main()
{
 perror("error!!!!!!");




 //fprintf(stdout,"hello fprintf stdout\n");
 //fprintf(stderr,"hello fprintf stderr\n");

 //fprintf(stdout,"hello fprintf stdout\n");
 //fprintf(stderr,"hello fprintf stderr\n");
 //
 //
 //fprintf(stdout,"hello fprintf stdout\n");
 //fprintf(stderr,"hello fprintf stderr\n");
 //
 //fprintf(stdout,"hello fprintf stdout\n");
 //fprintf(stderr,"hello fprintf stderr\n");
 //
 //fprintf(stdout,"hello fprintf stdout\n");
 //fprintf(stderr,"hello fprintf stderr\n");
 //
 //
 //fprintf(stdout,"hello fprintf stdout\n");
 //fprintf(stderr,"hello fprintf stderr\n");
 //
 return 0;
}
